<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>我是一个标题</title>
</head>
<body>
    <div class = "outerDiv">
        <div class = "innerDiv d1">框1</div>
        <div class = "innerDiv d2">框2</div>
        <div class = "innerDiv d3">框3</div>
    </div>
    
</body>
</html>